// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
#pragma once

#include <kmsql/sql/grammar/statement.h>

// Note: Implementations of constructors and destructors can be found in statements.cpp.
namespace kmsql {
    enum ActionType {
        DropColumn,
    };

    struct AlterAction {
        AlterAction(ActionType type);

        ActionType type;

        virtual ~AlterAction();
    };

    struct DropColumnAction : AlterAction {
        DropColumnAction(char *column_name);

        char *columnName;
        bool ifExists;

        ~DropColumnAction() override;
    };

    // Represents SQL Alter Table statements.
    // Example "ALTER TABLE students DROP COLUMN name;"
    struct AlterStatement : SQLStatement {
        AlterStatement(char *name, AlterAction *action);

        ~AlterStatement() override;

        char *schema;
        bool ifTableExists;
        char *name;
        AlterAction *action;
    };
} // namespace kmsql
